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A025028
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Least non-residue mod n is 23.
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0
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10559, 15791, 21118, 31582, 50951, 53231, 53881, 88079, 88919, 92569, 97919, 101902, 102001, 106462, 107762, 123191, 128519, 130729, 138311, 142271, 144169, 158759, 166319, 166609, 167879, 173209, 174599, 176158, 176401, 177838, 185138
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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PROG
| Contribution from Michael B. Porter (michael_b_porter(AT)yahoo.com), Apr 30 2010: (Start)
(PARI) residue(n, m)={local(r); r=0; for(i=1, floor(m/2), if(i^2%m==n, r=1)); r}
isA025028(n)={local(a); a=1; forprime(p=2, 19, a=a && residue(p, n)); a=a && !residue(23, n); a} (End)
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CROSSREFS
| Sequence in context: A065319 A063060 A187727 * A063063 A183600 A063433
Adjacent sequences: A025025 A025026 A025027 * A025029 A025030 A025031
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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